The angular acceleration of the magnetic disk is determined as 35 rad/s².
Conservation of angular momentum
The angular acceleration of the disk is determined from the principle of conservation of angular momentum.
τ = Iα
where;
τ is torqueI moment of inertia of the diskα is angular acceleration of the diskI = ¹/₂MR²
I = ¹/₂ x 0.2 x 2²
I = 0.4 kgm²
α = τ/I
α = (14)/(0.4)
α = 35 rad/s²
Thus, the angular acceleration of the disk is determined as 35 rad/s².
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if water completely boils in 7 minutes, how long does it take to evaporate
Answer: 20 minutes
Explanation: omm its 20 minutes
A cue ball of inertia m is given a speed v before it collides elastically with a full rack of 15 stationary balls in a game of pool. Each of the 16 balls has an inertia m.
The final speed of the 15 stationary balls in a game of pool is determined as the ratio of inertia of the cue ball to total mass of the 15 balls.
Final speed of the 15 balls
The final speed of the 15 balls can be determined by applying the principle of conservation of linear momentum as shown below;
J = ΔP
where;
J is inertia ΔP is change in momentumm1u1 + m0u0 = m1v1 + m0v0
where;
m1 is mass of the cue ballm0 is mass of the 15 ballsu is initial velocityv is final velocitym1u1 - 0 = m1v1 + 15mv0
m1u1 - m1v1 = 15mv0 - 0
recall, m1u1 - m1v1 = ΔP = J
-m = 15m0v0
v0 = -m/15m0
where;
v0 is the final speed of the 15 balls15m0 is the total mass of the 15 ballsm is the inertia of the cue ballThus, the final speed of the 15 stationary balls in a game of pool is determined as the ratio of inertia of the cue ball to total mass of the 15 balls.
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In case of a Crash the pilot of the plane jumped from it and opened his parachute after falling through 40m
Answer: 20m
Explanation: because half 40 is 20
Answer:
20m
Explanation: because half 40 is 20
1. Predict whether the energy required to remove an electron from magnesium and potassium would be more or less than that required to remove an electron from sodium. Explain your prediction in terms of the forces and interactions involved in this process. \
FILL OUT THE TABLE PLEASE WITH A GOOD ANSWER FOR BRAINLIEST!
In both cases less energy is required
But comparetively Mg require more energy than K
Let's see the electron configuration of Both
[Mg]=1s²2s²2p⁶3s²=[Ne]3s²[K]=1s²2s²2p⁶3s²3p⁶4s¹=[Ar]4s¹K has only one valence electron so very less ionization enthalpy so less energy required
Mg has 2 so more IE hence more energy required
When discussing Newton’s laws of motion, which terms do people most likely use when talking about Newton’s third law of motion?
“force” and “acceleration”
“inertia” and “force”
“action” and “reaction”
“mass” and “inertia”
Answer:
action and reaction
Explanation:
becase it state that"to every action there is always an equal and opposite reaction"
Why is work measured in
Newton-Meters (NM)?
A. Newton invented work.
B. The equation for work consists of one factor.
C. The equation for work consists of two factors.
D. Newton discovered work.
Answer:
C) the equation consists of two factors:
work = force * distance
W = F · S
25. IF THE ROADWAY IS WET AND THE CAR STARTS TO SKID, YOU SHOULD: A. Slow down by pumping the brakes quickly and firmly B. Slow down by shifting to a lower gear C. Slowly ease your foot off the gas pedal
If the roadway is wet and the cars starts to skid, one should slow down by shifting to lower gear. The correct option is B.
What are gears?A gear is component used to transmit motion. They are used in cars, trucks, machines, bicycles, etc.
For a car to avoid skidding on the wet roads, one must drive the car slowly. This can be done by shifting the gear to the lower one. This will help car to keep balance when brakes are applied on wet roads.
Thus, the correct option is B.
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A light pointer is stuck to the rubber sheet so that it pivots about a point P near the
rim of the glass, as shown (enlarged) below.
This arrangement acts as a simple thermometer.
State two disadvantages of such a thermometer.
What stands in for a "creator" in scientists view of the universe?
*
1 point
The laws of physics
The "Big Bang"
String Theory
Humans create the universe
In scientists view of the universe The creator is replace by: (B). The "Big Bang"
Meaning of Big Bang
The Big bang is a theory propagated by scientist and astronomers to replace the creator.
The Big Bang is said to be a reason for the universe and all the planets in it. Scientist say the universe started as just a single point with very high temperature and density, and then here comes the big bang.
In conclusion, In scientists view of the universe The creator is replace by: The "Big Bang"
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Which word is described by this statement? This is the top of the volcano where sulfur-filled gasses and lava come out.
Answer:
I believe it is crater.
PLS HELP: How do you think the mass media present mental disorders? Do you think the portrayals are accurate or inaccurate? Why?
The mass media present mental disorders by the daily soap programs and movies.
What is mass media?Mass media is the means of communication that reach large numbers of people in a few seconds through optical fiber transmission cables connection, such as television, newspapers, magazines, and radio.
Studies show that both entertainment and news media provide dramatic and distorted images of mental disorders. It can lead to more dangerous personality to develop in people including fear, rejection, derision and ridicule. The criminal activity has received heavy coverage in the mass media.
Thus, the mass media present mental disorders by the daily soap programs and movies.
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why is it difficult to move the heavier object than the lighter object on any surface
Answer:
it's is because the heavier the object is the more it will be pulled down by gravity n the lighter the object the lesser the gravity will pull it down
Answer:
why is it difficult to move the heavier object than the lighter object on any surface
The ball and the shoulder area ABOVE the armpit of an attacker make contact and the ball goes into goal. What is the decision by the referee?
The referee should award a goal to the attacker since the part of the body in contact with the ball is not hand and it cannot be considered as handball.
Goal rules for soccerThere are several rules considered during a game of soccer before the referee will award goal.
Some of the rules include;The ball must cross the goal lineThe attacker must be on sideThe attacker must play the ball with any part of the body EXCEPT the hand.The shoulder area ABOVE the armpit is not part of the hand, thus the referee should award a goal to the attacker since the part of the body in contact with the ball is not hand and it cannot be considered as handball.
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A ball thrown vertically upwards from ground
level hits the ground after 4 s. Calculate the
maximum height it reached during its journey.
(SC/GCE)
parabolic motion
[tex]\tt t_{max}=\dfrac{2u~sin~\alpha }{g}[/tex]
[tex]\tt h_{max}=\dfrac{u^2sin^2\alpha }{2g}[/tex]
vertically upwards ⇒ α = 90°⇒sin 90° = 1
[tex]\tt 4=\dfrac{2u}{10}\rightarrow u=20~m/s[/tex]
[tex]\tt h_{max}=\dfrac{20^2}{2.10}=\boxed{\bold{20~m}}[/tex]
What are the advantages of using digital signals over analog signals?
Digital signals are advantageous over analog signals because they are easily reproducible and convey information with little interference.
What are analog and digital signal?
Analogs signals are signal which are continuous whereas digital signals are signal which are not continuous but are separated by time.
Use of digital signals are most common because they have certain advantages over analog signals.
Some advantages of digital signals over analog signals include:
Digital signals can convey information with less noise and interference.Digital circuits can be easily reproducedTherefore, Digital signals are advantageous over analog signals because they are easily reproducible and convey information with little interference.
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The F-35B Lightning II is a short-takeoff and vertical landing fighter jet. If it does a vertical takeoff to 20.00-m height above the ground and then follows a flight path angled at 26o with respect to the ground for 25 km, what is the final displacement in meters
The final displacement of the F-35B Lightning fighter jet is determined as 24,991.2 m.
Displacement of the flight
The displacement of the flight is calculated from triangle method of vector addition as follows;
Let the vertical take off = first length of triangleLet the flight path at 26⁰ = second length of triangleLet the displacement = third side of triangleAngle between the first two sides = 90 - 26⁰ = 64⁰
r² = a² + b² - 2abcosR
r² = 20² + 25000² - (2 x 20 x 25000) x cos(64)
r² = 624,562,028.9
r = 24,991.2 m
Thus, the final displacement of the F-35B Lightning fighter jet is determined as 24,991.2 m.
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How to convert work done in joules into kilojoules?
1 Kilojoule [kJ] = 737.562 149 277 27 Foot pound force [ftlbf]
Answer:
divide by 1000
Explanation:
eg 1kJ is equal to 1000J
The force on the wire is directed?
Answer: A
Explanation:
Which statement about Earth’s core helps explain Earth’s magnetic field?
Earth's core is composed of iron and nickel is the correct statement about earth's core.
How earth's magnetic field is generated?Earth's magnetic field is generated by the solidification of the planet's liquid iron core. The cooling and crystallization of the core moves the surrounding liquid iron that creates powerful electric currents that generate a magnetic field.
So we can conclude that Earth's core is composed of iron and nickel.
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How do stairs reduce the
amount of effort needed to
get work done?
A. They require a large force over a long
distance.
B. They require a small force over a long
distance.
C. They require a large force over a short
time.
Electricity and Magnetism: Tutorial
Drag each balloon to the correct location on the chart.
Sort the balloons based on the kinds of charges they carry.
Not Charged
Positively Charged
Negatively Charged
Not charged - balloon A
Positively charged - balloon C
Negatively charged - balloon B and D.
What is charge?Charge is the property of an object which attracts or repels unlike and like charges respectively.
For balloon A, positive charges are equal to the negative charges. So, it is neutral or having no charge.
For balloon B and D, negative charges are greater than the positive charges. So, balloons are negatively charged.
For balloon C, positive charges are greater than the negative charges. So, balloons are positively charged.
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A 84-kg man stands on a bathroom scale inside an elevator. the scale measures in units of newtons. (a) the elevator accelerates upward from rest at a rate of 1.20 m/s2 for 1.50 s. what does the scale read during this 1.50 s interval
Answer:
94 kg
Explanation:
The mass registered by the scale is based on the assumption that the force applied is due entirely to gravity. If the force is greater, then the indicated mass will be greater.
__
how many g'sAs a fraction of the acceleration of gravity, the elevator's acceleration is ...
(1.2 m/s²)/(9.8 m/s²) ≈ 6/49
net forceThe force required to produce a given acceleration is found by the formula ...
F = ma . . . . . . . force on mass m to produce acceleration 'a'
When the man is stationary on the scale, the upward force it supplies is balanced by the downward force on the man due to gravity. The force and the mass are proportional, and the constant of proportionality (the acceleration due to gravity) is used to calibrate the scale. More force is thus translated to a higher mass reading.
Since the man's net acceleration is upward at the rate of 6/49×g, the total force applied by the scale is (1 +6/49) = 55/49 times as great as when the man is stationary. This greater force gets translated to a greater mass reading.
The force is equivalent to what would be required to support a stationary man with a mass of ...
(84 kg)(55/49) = 94 2/7 kg
The scale would read about 94 kg during the upward acceleration period.
How does the amount of energy needed to melt 1 kg of ice at 0°C compare to the
amount of energy needed to change 1 kg of water to steam at 100°C? Base your
answer on the heat of fusion of water and the heat of vaporization of water.
(A) It takes about two-thirds as much energy to boil the water as to melt the ice.
(B) It takes the same amount of energy to boil the water and melt the ice.
(C) It takes about two-thirds as much energy to melt the ice as to boil the water.
(D) It takes more than six times as much energy to boil the water as to melt the
ice.
(A) It takes about two-thirds as much energy to boil the water as to melt the ice.
Water is added to a measuring cylinder containing 100 cm3 of liquid paraffin. (the density of paraffin is 0.80 g/ cm3 and that of the water is 1.0 g / cm3 .) as the water is added, the level of the paraffin rises to 150 cm3 . the paraffin and water do not mix. what finally is the total mass of liquid in the measuring cylinder?
The total of the liquid in the measuring cylinder given the data from the question is 130 g
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to determine the mass of paraffin Density of paraffin = 0.80 g/cm³Volume of paraffin = 100 cm³Mass of paraffin =?Mass = Density × Volume
Mass of paraffin = 0.8 × 100
Mass of paraffin = 80 g
How to determine the mass of water Density of water = 1 g/cm³Volume of paraffin = 100 cm³Volume of paraffin + water = 150 cm³Volume of water = 150 – 100 = 50 cm³Mass of water =?Mass = Density × Volume
Mass of water = 1 × 50
Mass of water = 50 g
How to determine the mass of the mixture Mass of water = 50 gMass of paraffin = 80 gMass of mixture =?Mass of mixture = Mass of paraffin + Mass of water
Mass of mixture = 80 + 50
Mass of mixture = 130 g
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-1 A 4m long wire of cross-sectional area 2.5 X 10 m² has a resistance of 5. The conductivity of the wire is (a) 2.5 X 10' m (b) 4.0 X 10' m (c) 2.5 X 10'' m¹ -1 -1 (d) 4.0 X 10''m'
Answer:
3.2 [tex]10^{-2} ohm^{-1} m^{-1}[/tex]
Explanation:
Resistance=5 ohm
Length=4m
Cross sectional area=2.5 x 10
Conductivity = 1/ resistivity
=[tex]\frac{length}{resistance x cross sectional area}[/tex]
Conductivity=4 /5 x 2.5 x 10
Conductivity=4/125
Conductivity=3.2x[tex]10^{-2}[/tex][tex]ohm^{-1} m^{-1}[/tex]
Why is it not possible to achieve a higher resolution in the light microscope?.
Explanation:
Because resolution of the light microscope cannot be small than the half of the wavelength of the visible light
a 4kg box is resting on top of a shelf that is 2m high, what is the boxs gravitational potential relative to the floor
Answer:
80 J
Explanation:
PE = mgh
PE = (4 kg)(9.8 m/s^2)(2 m)
PE = 78.4 J and with sig figs, it would be 80 J
Two astronauts are taking a spacewalk outside the International Space Station. The first astronaut has a mass of 85.2 kg. The second has a mass of 65.4 kg. Initially, both astronauts have zero velocity relative to each other. Then, the astronauts push against each other, giving the first astronaut a final velocity of 1.2 m/s to the left. If the momentum of the system is conserved, what is the final velocity of the second person?
A. 1.3 m/s to the left
B. 1.6 m/s to the right
C. 1.6 m/s to the left
D. 1.3 m/s to the right
The final velocity of the second person after the collision is determined as 1.6 m/s to the right.
Final velocity of the second person
The final velocity of the second person is determined by applying the principle of conservation of linear momentum.
m1u1 + m2u2 = m1v1 + m2v2
85.2(0) + 65.4(0) = 85.2(-1.2) + 65.4(v2)
0 = -102.24 + 65.4v2
65.4v2 = 102.24
v2 = 1.56 m/s to the right
Thus, the final velocity of the second person after the collision is determined as 1.6 m/s to the right.
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Which labels belong in the regions marked X, Y, and Z?
OX: Smaller nuclei form
Y: Thermal energy is produced
Z: A larger nucleus forms
OX: Large amounts of energy are released
Y: One or more neutrons is released
Z: Smaller nuclei form
OX: One or more neutrons is released
Y: A larger nucleus forms
Z: Large amounts of energy are released
OX: A larger nucleus forms
Y: Large amounts of energy are released
Z: Smaller nuclei form
The following depict the letters X, Y and Z
X: A larger nucleus formsY: Large amounts of energy are releasedZ: Smaller nuclei formWhat is fusion and fission?Fusion refers to a situation in which two light nuclei come together to form a heavier nucleus. Fission refers to the disintegration of a nucleus by the bombardment of a particle.
The portions that show the letters marked X, Y and Z are;
X: A larger nucleus formsY: Large amounts of energy are releasedZ: Smaller nuclei formMissing parts:
Roberto makes a graphic organizer to compare fusion nuclear reactions and fission nuclear reactions. A venn diagram with 2 intersecting circles The circle on the left is labeled fusion. The circle on the right is labeled fission. There is a Z in the fission circle. There is an Y in the intersecting area. There is an X in the fusion circle. Which labels belong in the regions marked X, Y, and Z?
OX: Smaller nuclei form
Y: Thermal energy is produced
Z: A larger nucleus forms
OX: Large amounts of energy are released
Y: One or more neutrons is released
Z: Smaller nuclei form
OX: One or more neutrons is released
Y: A larger nucleus forms
Z: Large amounts of energy are released
OX: A larger nucleus forms
Y: Large amounts of energy are released
Z: Smaller nuclei form
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Answer: D
Explanation: I just took the exam review in edge 2022 and got it right
Calculate the kinetic energy of a tennis ball that has a mass of .056 kg and is moving at a speed of 44 m/s
[tex]\text{Kinetic energy,}\\\\E_k = \dfrac 12 mv^2\\\\~~~~~=\dfrac 12 \times 0.056 \times 44^2\\\\~~~~~=54.208~J[/tex]